private synchronized MultiSelection<Object> getMixedSelection() {
if (mixedSelection == null) {
mixedSelection =
MultiSelection.from(
Object.class,
new ObservableSet<Object>() {
@Override
protected ImmutableSet<Object> compute() {
if (tv != null) {
ISelection s = tv.getSelection();
if (s instanceof IStructuredSelection) {
Object[] elements = ((IStructuredSelection) s).toArray();
return ImmutableSet.copyOf(elements);
}
}
return ImmutableSet.of();
}
});
debug("mixedSelection", mixedSelection.getElements());
}
if (tv != null) {
addViewerSelectionListener();
}
return mixedSelection;
}
@Override
public synchronized MultiSelection<BootDashElement> getSelection() {
if (selection == null) {
selection = getMixedSelection().filter(BootDashElement.class);
debug("selection", selection.getElements());
}
return selection;
}
public AbstractBootDashAction(MultiSelection<BootDashElement> selection, UserInteractions ui) {
this.selection = selection;
this.ui = ui;
selection
.getElements()
.addListener(
new ValueListener<Set<BootDashElement>>() {
public void gotValue(
LiveExpression<Set<BootDashElement>> exp, Set<BootDashElement> selecteds) {
updateEnablement();
}
});
}
public static <T> MultiSelection<T> union(MultiSelection<T> a, MultiSelection<T> b) {
Assert.isLegal(a.getElementType().equals(b.getElementType()));
return from(a.getElementType(), LiveSets.union(a.getElements(), b.getElements()));
}